To ring or not to ring?

I know that my school's career services office has its own line on this question (do what you feel comfortable with), but the ring dilemma seems to come up every interview season. The WSJ blog The Juggle has posted on this here, and it seems there are many opinions out there. Basically, there is no real bright line rule, which indicates the question will linger on. (I also recommend checking out the post's comments, which include many from lawyers and former lawyers.)

Has anyone here had negative (or positive) ring experiences in interviews? Or does it really not matter (as I think many career offices say)?